If I may jump in with a question. I have a jupiter but my Drake 2B rcvr
might need this, after I recap it.
I have a MFJ 259B antenna tester, which will work as a frequency counter
that does resolve to 1 hz. Do I need to build a probe with a clip on
the outboard end, or is placing my antenna close to the circuit
sufficient? There is a max of 5V Peak-to-peak on the input of the counter
John Graves
WA1JG
jh.graves@verizon.net
Ken Brown wrote:
he tried to set up the bfo adj's ,but didn't have test gear up to the task.
Test gear needed to adjust BFO crystal oscillator frequencies in Omni VI
(and I am guessing also Omni V)
Method 1, simplest:
1 eA frequency counter with resolution and accuracy down to about 10 Hz
at 9 MHz.
1 eA high impedance probe
1 eA insulated trimmer capacitor adjustment tool
Method 2, if you don't have access to the frequency counter, but more
difficult:
1 eA general coverage receiver that can listen to 9.000 MHz and 9.003
MHz. Doesn't even need to have a BFO.
1 eA 100 kHz crystal calibrator that will generate harmonics up to 9 or
10 MHz (10 MHz so you can calibrate the calibrator against 10 MHz WWV)
1 eA computer with sound card and program that can accurately tell you
the beat frequency between 9.003 MHz and 90th harmonic of 100 kHz.
1 eA high impedance probe
1 eA insulated trimmer capacitor adjustment tool
You can build the probe from a small capacitor and a resistor, or you
may even get enough signal with a little pick up loop on the end of a
piece of coax. Even a plain screwdriver will do, but will require more
patience and finesse.
DE N6KB
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